Improvement in devices for spreading circular-saw teeth



W. H. RUDOLPH. Spreading Saw Teth.

No. 107,963. Patented 0m. 4, 1870.-

m T W M N. PETERS, PND'I'OJJTHOGRAPNER. WA$WNGTOM D. 6-.

1 spreading the teeth.

"pate (type. 7

animate WILLIAM RUDOLPH, or

CIJARKSVILLE, TENNESSEE;

Letters PatentNo. 107,963, dated October 4, 1870.

.IMPROVEMENT IN DEVICES FOR SPREADING CIRCULAR-SAW TEETH.

The Schedule referred to in these Letters Patent andmaking part of the same To all whom it may concern; Be it known that I, WILLIAM H;.Run0nr ti{of ,Glarksville, in the county of Montgomery and State; of Tennessee, have invented a new ZllldfHSQfilil 1m *provement in Device for Spreading Circular-saw Teeth; andI do hereby declare that the following is a full, clear, and exact descriptionthereofiwhich will enable others skilled, in the art to make. and use: be

same, reference being, had to the-accompanying] raw; 3

ing forming part of this specification- The object of this invention is to facilitatelar-saw teeth, so as to give. a sharp cnt-ting-edge-to the teeth, and relieyethe saw of friction; and

It consists in a metallic plate, provided with 17l'0- jecting ears for. holding the tooth to be spread, and for holding theplate on the saw, the whole constructed and operating ashereinafter more fully described In the accompanyingdrawing- Figure 1 representsa perspective view of the plate,

with the parts attached thereto applied to the saw.

Figure 2 is a view of a'pnnch, which is. used for Similar letters of reference indicate corresponding parts. 7 f r A'represents the plate, which may be, made of cast or wrought metal, with ears attached tot-he sides thereof, between which ears the saw-teeth are placed, when the points arespread.

, i B is'a plate of steel; which is firmly attached'to the plate A by screwsor otherwise, which servesas an anvil in spreading the teeth. The mode of applying the plate is seen in fig. 1. r

O representstheitir ears, which serve for holding .the plate in position on the saw,

n eration of spreading or expanding the pointsof ciron-f V represents" the forward cars, which maybe in any convenient form, the outer ends otwhich are connected bya-pim'F.

The tooth to be spread is passed through the space between this pin and the steel plate B, as seen in the :drawihgpthe position of the point of the tooth on the steelfpiate being governed bythe gauge-screw D.

a j The space between the ears 0 is designed to he just widevenongh to admit the saw at or near the base of the tooth, and the space between the front ears E admits the point of the tooth.

When the point of the tooth is placed on the steel anvil, as seen in fig.1, it is spread by a blow onasteel punch.

'G is the punch. The punch is necessarily a little crooked, to allow its end to sit squarely on the tooth. A smart blow with a hammer on the punch spreads or expands the point laterally in each direction. The little lips, thus formed on each side of each of the points serve, instead of the ordinary set of the saw, to give the saw clearance, and allow it to run without friction, and also to shave the side of the lumber sawed, and make it smooth and merchantable. The cutting-points of the teeth are thus made thin and sharp, so that a good cutting-edge is preserved for a much longer period than by the ordinary filing.

Having thus described my invention,

1- claim as new and desire to secure by Letters Patent The plate A, with the auviiB, ears G G and E E, pin '1 and gauge-screw D, when applied to a saw, substantially as and for the purposes herein shown .and described.

WILLIAM .H. RUDOLPH..

Witnesses: V

R. S. Moose, J AS. E, BROWNING. 

